Glaucophane and Sillimanite Physical Properties
Tenacity
Not Available
  
Tough
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3-3.15
  
3.20-3.26
  
Fracture
Conchoidal, Brittle, Conchoidal
  
Splintery
  
Cleavage
Good on [110] and on [001]
  
{010} perfect
  
Mohs Hardness
6.0-6.5
  
6-7.5
  
Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
  
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Glaucophane and Sillimanite Chemical Formula
While comparing Glaucophane and Sillimanite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Glaucophane and Sillimanite chemical formula.
- Chemical formula of Glaucophane- [ ]Na2(Mg3Al2)Si8O22(OH)2
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Glaucophane and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Glaucophane and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Glaucophane and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Glaucophane is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.